@Trevor McLean try adding the parameter

fireSlavingSync: true

when you set the rate. I have had to use that parameter in the past to resolve issues with commitLine

rec.setCurrentSublistValue({
	sublistId: 'item',
	fieldId: 'item',
	value: programItem,
	// must wait for column fields to load for rec.commitLine to work properly
	fireSlavingSync: true
});
rec.commitLine({ sublistId: 'item' });